Method of making sound and vibration insulating units



31a/ventola 5 ,3 M. x ....L. W 1 Lm, 1 i. ."2 4 e .h s d R e n.. S F

Lg. Rosenz wie ig,

METHOD OF MAKING SOUND AIND VIBRATION INSULATING UNITS Spt. 25, 1928.

Patented Sept. 25, 1928.

uNirEn stares rarest ori-fics.

SIEGFRIED ROSENZWEIG, OF NEW YQRK, N.

METHOD OF MAKING SOUND AND VIBRATION INSULTING UNITS.

Application led September 4, 1925. Serial No. 54,585. a

i simple and' practical method whereby insulat ing units of thev type employing strips or sections of' cork or the like may be made in thoroughly practical and more expeditious manner than heretofore.

In making units of' the character set forth it-is customary to use a surrounding metal frame or clamping band. A straight outside frame is essential especiallyv when' the plates are placed side by side on a concrete foundation and a gap between the same due to curvature of the frame which would be undesirable. Therefore, in the method now in vogue the frame is made firstand the strips or sections of cork are eut and, to prevent bulging` of the frame,viitted loosely into the frame as an initial operation. *'lhen, after the strips have been fitted they are removed and immersed in or otherwise applied with a binder and again reset into the frame so that when the binder vsets or dries all of the cork sections vwill be held in position within the frame and not drop out. Usually an asphalt binder is used. However, this method has proven undesirable not only fromthe stand- .point of requiring a multiplicity of operations in the manufacture of the unit, but also after a time the asphalt binder hardens and destroys to a .certain degree the resilient shock-absorbing and sound deadening effect of the cork. v

Accordingly, the present invention aims to provide a method of making the insulating units which will obviate the necessity of a binder being used; Ido away with theextra step of first fitting the corks into the frame, and then removing them and putting them back again after the binder has been applied; and primarily to preserve the maximum resiliency of the cork.

Therefore, the present invention contemplates a method which will effect considerable economy in the manufacture of these units whilel at the same time preserve them in such a way that their efficiency and longevity will be maintainedand increased.

Since the method may be carried intoA effect with various forms of apparatus, the accompanying, drawings illustrate a more or less diagrammatic form,'the means employed and steps of the method herein described. Therefore,

Figure 1 is a diagrammatm plan View illus-l trating the initial step of the present method.

Figure 2 is a diagrammatic view of a press or the like illustrating a subsequent stepy of the method.

Figure 3 is a further diagrammatic view illustrating an alternative way .of pressing the body ing material. Y Y

Similar reference characters designate corresponding parts throughout the Several figures of the drawings.

l Accordingly, with a view to overcoming of yielding shock and sound absorbthe objection incident to the use of the'binder and also provide 'adequate' means for holding the strips or sections in place, I propose to use a frame or band B, of metal having the normal shape shown in dotted lines shown in Figure 1 and into this frame I p'ress a plurality of strips C of cork or its equivalent. As it is ractically impossible tocut cork strips to lit in such way that-no gap will exist between them, I propose to crowd them into the frame permitting the sides of the frame to bulge slightly outwardly as indicated in -an exaggerated way at B.

After the strips have been fitted in place in the manner indicated the entire frame i's indicated asP, and comprisingthe press jaws l operated in any suitable manner as by the .crews 2 or their equivalent. The frame B after being placed within the press is subjected on all sides to pressure in such a way that all slack between the single or individual cork or equivalent strips'is taken up until the -equality in thestrips thus locking or holding all of the strips in position so that they will placed in a suitable press diagrammatically Y not pull out of the frame, but also provides a.

compressed body of cork having greater re'- sistance to both vibration land sound. y

y From the foregoing it will be apparent that that first step 'in the present method is to assemble the cork strips C within the metal frame or band in such away that the sides of the frame are caused to bulge or flex outwardly under the pressure of the bulk of cork crowded into the frame. Then, the entire unit is subjected to a' pressing operation wherein the metallic frame is pushed in- Wardly from all sides thereby to straighten out the sides of the frame, and simultaneously pressing the cork strips together so that each section is held fixed with reference to the other by friction thereby obviating the necessity of an adhesive binding. Furthermore', there is only one insertion of the strips which are left in place after being crowded into position. While it is preferred to stop the operatio of pressing the frame when the sides ofthe frame becomes straight, nevertheless, the same may be pressed further as indicated at B2 in Fig. 2, if desired, to thereby reinforce the frame. A plate of this type however would preferably be used where it did not adjoin another plate, because as previously indicated itis undesirable to have anyspace between the plates or units under certain conditions of use. l i

The pressing inward of the frame not only produces a finished appearance, but also gives the frame a considerable resistance againstv the outward pressure of thc cork, especially when the weight of the machine is placed on it.

Figure 3 of the drawings illustrates a clamping band or frame made in sections B3 and B, thelatter being relatively adjustable with respect to the former, thereby to compress and clamp the cork or equivalent material in the frame. In making a unit of this typethe same method is pursued, except that in the pressing or compressing step the member B* may be moved relatively to the'member Bainstead of bending the metal frame itself.

If desired', the frame havingthe cork strips therein after the initial assembly, be subjected to`heat so that the cork will'shrink somewhat and permit the frame to be pressed inwardly under less resistance.

However, the preferred method involvesA the distinguishing characteristics above set forth and it is thought that without further description that the advantages ofthe present method will be well understood' by those l skilled in the art.

l. A method of making .sound and vibration insulating units of the type including a sound deadcning center and a metal frame which consists in assembling a plurality `,of pieces of soft material in a rectangular metal frame until the sides of the frame bulge outwardly, and subsequently restoring the frame `to its normal shape by exerting pressure on (lll to bend the same inwardly to thereby take up slack between the b-locks and compress them into locking engagement with eachI other and the frame.y

In testimony whereof I hereunto alix my signature.

SIEGIRIED RSENZWEIG. 

